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…showed last 75 words of 454 total…grave danger. Third, the sheer numbers of Jews to be killed and the difficulties doing it caused for the police who did the shooting were passed on by Himmler to Hitler. There had been discussions on the use of poisonous gas as a means of killing Jews and avoiding public spectacles that sometimes accompanied shooting throughout the autumn of 1941. These events led to the design of the concentration camp. The most infamous camp was Auschwitz.